GprsMonitor.ino

#include <Arduino.h>
#include <SoftwareSerial.h>
#include <SPI.h>
#include <Adafruit_GFX.h>
#include <Adafruit_PCD8544.h>

SoftwareSerial gprsSerial(7, 8);
Adafruit_PCD8544 display = Adafruit_PCD8544(3, 4, 5);

String readAnswer() {
  while (!gprsSerial.available()) {}
  return gprsSerial.readStringUntil('\n');
}

int counter = 0;

void setup()   {
  Serial.println("GPSR Monitor");
  pinMode(9, OUTPUT);
  digitalWrite(9, HIGH);
  Serial.begin(115200);
  gprsSerial.begin(9600);

  display.begin();
  display.setContrast(50);
  display.display();
  delay(2000);
  digitalWrite(9, LOW);

  display.clearDisplay();
  display.display();

  display.display();
  bool ok = false;

  while (!ok) {
    counter++;
    counter %= 10;
    display.clearDisplay();
    display.setCursor(0, 0);
    display.print("Wait SIM "); display.println(counter);
    display.display();
    gprsSerial.print("AT\r");
    while (gprsSerial.available()) {
      String answer = readAnswer();
      ok = !answer.equals("");
    }
    display.display();
    delay(500);
  }

  while (gprsSerial.available())
  {
    readAnswer();
  }

  display.clearDisplay();
  display.display();
  display.println("Set Pin");
  display.display();
  gprsSerial.print("AT+CPIN=1210\r");
  display.println(readAnswer());

  while (gprsSerial.available()) {
    readAnswer();
  }

  display.display();

}

void loop() {
  counter++;
  counter %= 10;
  display.clearDisplay();
  display.setCursor(0, 0);
  display.print("Signal ");
  display.println(counter);
  gprsSerial.print("AT+CSQ\r");
  display.println(readAnswer());
  display.println(readAnswer());
  display.println(readAnswer());

  while (gprsSerial.available()) {
    readAnswer();
  }

  display.display();
  delay(2000);
}